Has a colour scale in Micrometres. With magnetic tip, it can stick to any curved or a hard-to-reach place. The thickness of the varnish and putty is measured by touching the tip of the tester with the magnet of the being tested (the must be clean and free of dust). For measuring the thickness of varnish coatings with an accuracy of 20 Micrometres. Quick and precise checking whether the vehicle was painted in the past. Used to detect the thickness of paint coats that are to the eye on vehicles made of sheet steel and galvanized steel. Does not require battery power. Fine workmanship. Water . High accuracy and reliability. Convenient to use. and practical. Individual Colors On The Scale Indicate: Blue Color: coating with a thickness of 0.0 to 100 Micrometres - a thin coat of varnish (varnish without foundation or repeatedly polished) Green Color: coating with a thickness of 100 to 200 Micrometres for varnishes. Warning; in newer car models, 180 Micrometre thickness may indicate a thin layer of the second varnish. Yellow Color: coating with a thickness of 200 to 300 Micrometres - after painting repairs ("second varnish"). Red Color: coating with a thickness of 300 to 520 Micrometres - after sheet metal repairs + a second varnish. Black Color: coating with a thickness of over 520 - putty and varnished (the amount of putty about 0.5 mm). Specification: new Colour:black Material:Metal Package Contents: 1 x Paint Thickness Tester Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.